added external logger support

lib/context.js

@@ -8,14 +8,15 @@ var commands = require('./command');
 var Context = function (stream, loggerOptions) {
   EventEmitter.call(this);
   
-  function consoleDecorator(data){
-   return console.log(JSON.stringify (data))
+  function consoleDecorator(arrow, data){
+   return console.log(arrow, JSON.stringify (data));
   }
-
-  this.debug = loggerOptions.debug
-  this.log = loggerOptions.logger.debug || consoleDecorator;
+  this.log = (loggerOptions.logger) ?
+    loggerOptions.logger :
+    consoleDecorator;
 
 
+  this.debug = loggerOptions.debug
   this.stream = new Readable();
   this.stream.setEncoding('utf8');
   this.stream.wrap(stream);
@@ -119,11 +120,11 @@ Context.prototype.end = function () {
 };
 
 Context.prototype.sendCommand = function (command) {
-  if (this.debug) this.log({ command: command });
+  if (this.debug) this.log('------->', { command: command });
   var self = this;
   return new Promise(function (resolve, reject) {
     self.send(command + '\n', function (err, result) {
-      if (self.debug) self.log({ err: err, result: result });
+      if (self.debug) self.log('<-------', { err: err, result: result });
       if (err) {
         reject(err);
       } else {

package.json

@@ -2,7 +2,7 @@
   "author": "Sergey Dmitriev <serge.dmitriev@gmail.com>",
   "name": "ding-dong",
   "description": "Write AGI-server quickly! (AGI - Asterisk Gateway Interface)",
-  "version": "0.1.5",
+  "version": "0.1.6",
   "repository": {
     "type": "git",
     "url": "git://github.com/antirek/ding-dong.git"